In pulmonary artery perfusion group, hypothermia washing-RBC solution was perfused through pulmonary artery from obstruction of ascending aorta to open of ascending aorta.

• 二、临床部分 目的：研究低温洗涤红细胞保护液肺动脉灌注对体外循环术后肺损伤保护作用的机制。